Phase evolution and microware dielectric properties of high-entropy spinel-type (Mg0.2Co0.2Ni0.2Li0.4Zn0.2)Al2O4 ceramics

被引：22
作者：
Xie, Mingjun [1 ]
Li, Xiao [1 ]
Lai, Yuanming [1 ]
Qi, Cong [1 ]
Yin, Jun [1 ]
Gong, Weiping [2 ]
Li, Yuanxun [3 ]
Liu, Qian [1 ]
Wu, Chongsheng [1 ]
机构：
[1] Chengdu Univ Technol, Sch Mech & Elect Engn, Chengdu 610059, Peoples R China
[2] Huizhou Univ, Guangdong Prov Key Lab Elect Funct Mat & Devices, Huizhou 516001, Peoples R China
[3] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Device, Chengdu 610054, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2024年 / 44卷 / 01期
关键词：
High-entropy ceramics; Phase evolution; Microwave dielectric properties; Single phase; Spinel structure; CRYSTAL-STRUCTURE; STRUCTURAL CHARACTERISTICS; LIF CERAMICS; BOND VALENCE; ZNO; ZNAL2O4; ENHANCEMENT; DEPENDENCE; CARBONATE; BEHAVIOR;
D O I：
10.1016/j.jeurceramsoc.2023.09.017
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, high-entropy spinel-type (Mg0.2Co0.2Ni0.2Li0.4Zn0.2)Al2O4 ceramics were synthesized by solid-state reaction method. The raw materials gradually formed spinel aluminates from 700 to 1400 degrees C and finally formed high-entropy (Mg0.2Co0.2Ni0.2Li0.4Zn0.2)Al2O4 ceramics after calcination at 1400 degrees C for 4 h. The high-configuration entropy and low average atomic-size difference were beneficial to form single-phase high-entropy ceramics. Partial lattice distortion occurred within the high-entropy (Mg0.2Co0.2Ni0.2Li0.4Zn0.2)Al2O4 ceramics structure, and its grain size gradually increased with increasing sintering temperature. The high-entropy (Mg0.2Co0.2Ni0.2Li0.4Zn0.2)Al2O4 ceramics exhibited good microwave dielectric properties when sintered at 1550 degrees C for 4 h: dielectric constant (epsilon r) = 7.4, quality factor (Qf) = 58,200 GHz, and temperature coefficient of resonance frequency (wf) = -64 ppm/degrees C. The epsilon r values were mainly affected by the dielectric polarizability. The Qf values were highly related to the relative density and covalency of A-site bond, whereas the wf values closely depended on the bond strength of A-site.
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页码：284 / 292
页数：9
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